Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual data tem um Clock de 0.8-1.6ghz?
 ###Tabelas: CREATE TABLE main_issuers (main_issuers_id AUTO_INCREMENT PRIMARY KEY, Currency VARCHAR, Country VARCHAR, Generic Name or Nickname VARCHAR, Rating ( S&P / Moodys ) VARCHAR, Negotiable debt at mid-2005 ( US dollar bn equivalent) INT, Government financial liabilities as % of GDP (end 2003 - source : OECD ) VARCHAR, Issuer VARCHAR, Internet site VARCHAR) CREATE TABLE top_assistants (top_assistants_id AUTO_INCREMENT PRIMARY KEY, Position VARCHAR, Number INT, Player VARCHAR, Super League INT, Champions League INT, Swiss Cup INT, Total INT) CREATE TABLE louisiana_parishes_ranked_by_per_capita_income (louisiana_parishes_ranked_by_per_capita_income_id AUTO_INCREMENT PRIMARY KEY, Parish VARCHAR, Per capita income VARCHAR, Median household income VARCHAR, Median family income VARCHAR, Population INT, Number of households INT) CREATE TABLE 2000s (2000s_id AUTO_INCREMENT PRIMARY KEY, Date INT, Name VARCHAR, Developer VARCHAR, Clock VARCHAR, Process VARCHAR, Cores per die / Dies per module VARCHAR) CREATE TABLE contestants_and_final_ranking (contestants_and_final_ranking_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Category VARCHAR, Eliminated VARCHAR, Date VARCHAR, Special Guest VARCHAR)  
SELECT Date FROM 2000s WHERE Clock = 0.8-1.6ghz